globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116414
论文题名:
Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene; new trace element records from the low latitude Indian Ocean
作者: Barnet J.S.K.; Harper D.T.; LeVay L.J.; Edgar K.M.; Henehan M.J.; Babila T.L.; Ullmann C.V.; Leng M.J.; Kroon D.; Zachos J.C.; Littler K.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 545
语种: 英语
中文关键词: Indian Ocean ; paleoceanography ; Paleocene-Eocene Thermal Maximum ; paleoclimate ; Paleogene ; trace elements
英文关键词: Carbon ; Earth (planet) ; Oceanography ; CO2 concentration ; Coupled evolution ; Depth migration ; Dissolved inorganic carbon ; Global climates ; Northern indian oceans ; Planktic foraminifera ; Stable isotopes ; Trace elements ; carbon dioxide ; carbon emission ; carbonate ; chemical composition ; chemostratigraphy ; concentration (composition) ; Eocene ; Paleocene ; temperature effect ; trace element ; Indian Ocean ; Foraminifera ; Morozovella
英文摘要: The early Paleogene represents the most recent interval in Earth's history characterized by global greenhouse warmth on multi-million year timescales, yet our understanding of long-term climate and carbon cycle evolution in the low latitudes, and in particular the Indian Ocean, remains very poorly constrained. Here we present the first long-term sub-eccentricity-resolution stable isotope (δ13C and δ18O) and trace element (Mg/Ca and B/Ca) records spanning the late Paleocene–early Eocene (∼58–53 Ma) across a surface–deep hydrographic reconstruction of the northern Indian Ocean, resolving late Paleocene 405-kyr paced cyclicity and a portion of the PETM recovery. Our new records reveal a long-term warming of ∼4–5 °C at all depths in the water column, with absolute surface ocean temperatures and magnitudes of warming comparable to the low latitude Pacific. As a result of warming, we observe a long-term increase in δ18Osw of the mixed layer, implying an increase in net evaporation. We also observe a collapse in the temperature gradient between mixed layer- and thermocline-dwelling species from ∼57–54 Ma, potentially due to either the development of a more homogeneous water column with a thicker mixed layer, or depth migration of the Morozovella in response to warming. Synchronous warming at both low and high latitudes, along with decreasing B/Ca ratios in planktic foraminifera indicating a decrease in ocean pH and/or increasing dissolved inorganic carbon, suggest that global climate was forced by rising atmospheric CO2 concentrations during this time. © 2020 The Author(s)
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164854
Appears in Collections:气候变化与战略

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作者单位: Camborne School of Mines, Environment and Sustainability Institute, University of Exeter, Penryn Campus, Cornwall, United Kingdom; Department of Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA, United States; Department of Geology, The University of Kansas, Lawrence, KS 66045, United States; International Ocean Discovery Program, Texas A&M University, College Station, TX, United States; School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; GFZ German Research Centre for Geosciences, Section Earth Surface Geochemistry, Telegrafenberg, Potsdam, 14473, Germany; Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, Southampton, United Kingdom; NERC Isotope Geosciences Facility, British Geological Survey, Nottingham, NG12 5GG, United Kingdom; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, United Kingdom; School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom

Recommended Citation:
Barnet J.S.K.,Harper D.T.,LeVay L.J.,et al. Coupled evolution of temperature and carbonate chemistry during the Paleocene–Eocene; new trace element records from the low latitude Indian Ocean[J]. Earth and Planetary Science Letters,2020-01-01,545
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